import pandas as pd
import numpy as np

data={"名字":['1','2','3'], "身高":['1','2','3'],"体重":['1','2','3'],
      "成绩":['1','2','3']}
datedf=pd.DateFrame(data)
a=np.mean(data("成绩"))
if a<60:
 print(a)
b=np.max(data("成绩"))
print(b)
print(datedf[datedf["成绩"]==max(datedf["成绩"])])